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A Brush-Model Based Semi-Empirical Tire-Model for Combined Slips

Svendenius, Jacob LU and Gäfvert, Magnus LU (2004) In SAE Technical Papers 2004-01-1064
Abstract
This paper presents a new method to derive the tire forces for simultaneous braking and cornering, by combining empirical models for pure braking and cornering using brush-model tire mechanics. The method is aimed at simulation of vehicle handling, and is of intermediate complexity such that it may be implemented and calibratedby the end user. The brush model states that the contact patch between the tire and the road is divided into an adhesion region where the rubber is gripping the road and a sliding region where the rubber slides on the road surface. The total force generated by the tire is then composed of components from these two regions. In the proposed method the adhesion and the sliding forces are extracted from anempirical... (More)
This paper presents a new method to derive the tire forces for simultaneous braking and cornering, by combining empirical models for pure braking and cornering using brush-model tire mechanics. The method is aimed at simulation of vehicle handling, and is of intermediate complexity such that it may be implemented and calibratedby the end user. The brush model states that the contact patch between the tire and the road is divided into an adhesion region where the rubber is gripping the road and a sliding region where the rubber slides on the road surface. The total force generated by the tire is then composed of components from these two regions. In the proposed method the adhesion and the sliding forces are extracted from anempirical pure-slip tire model and then scaled to account for the combined-slip condition. The combined-slip self-aligning torque is described likewise. The separation of the adhesive and sliding forces makes it possible to let the sliding force depend on the relative velocity between the tire and the road. This introduces a velocity dependence in the model, even though this is not explicitly present inthe pure-slip model. The approach is quite different from most previous combined-slip models, in that it is based on a rather detailed mechanical model in combination with empirical pure-slip models. The model is computationally sound and efficient and does not rely on any additional parameters that depend on combined-slip data for calibration. It can be used in combination with virtually any empirical pure-slip model and in this work the Magic Formula is used in examples. Results show good correspondence with experimental data. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
magic formula, velocity dependency, brush model, tire force, combined slip
in
SAE Technical Papers 2004-01-1064
publisher
SAE
external identifiers
  • scopus:30344449327
ISSN
0148-7191
language
English
LU publication?
yes
id
b68e445a-57d5-419c-946e-c129fec53ec4 (old id 535958)
alternative location
http://www.sae.org/technical/papers/2004-01-1064
date added to LUP
2007-09-25 11:54:20
date last changed
2017-09-10 04:35:51
@inproceedings{b68e445a-57d5-419c-946e-c129fec53ec4,
  abstract     = {This paper presents a new method to derive the tire forces for simultaneous braking and cornering, by combining empirical models for pure braking and cornering using brush-model tire mechanics. The method is aimed at simulation of vehicle handling, and is of intermediate complexity such that it may be implemented and calibratedby the end user. The brush model states that the contact patch between the tire and the road is divided into an adhesion region where the rubber is gripping the road and a sliding region where the rubber slides on the road surface. The total force generated by the tire is then composed of components from these two regions. In the proposed method the adhesion and the sliding forces are extracted from anempirical pure-slip tire model and then scaled to account for the combined-slip condition. The combined-slip self-aligning torque is described likewise. The separation of the adhesive and sliding forces makes it possible to let the sliding force depend on the relative velocity between the tire and the road. This introduces a velocity dependence in the model, even though this is not explicitly present inthe pure-slip model. The approach is quite different from most previous combined-slip models, in that it is based on a rather detailed mechanical model in combination with empirical pure-slip models. The model is computationally sound and efficient and does not rely on any additional parameters that depend on combined-slip data for calibration. It can be used in combination with virtually any empirical pure-slip model and in this work the Magic Formula is used in examples. Results show good correspondence with experimental data.},
  author       = {Svendenius, Jacob and Gäfvert, Magnus},
  booktitle    = {SAE Technical Papers 2004-01-1064},
  issn         = {0148-7191},
  keyword      = {magic formula,velocity dependency,brush model,tire force,combined slip},
  language     = {eng},
  publisher    = {SAE},
  title        = {A Brush-Model Based Semi-Empirical Tire-Model for Combined Slips},
  year         = {2004},
}